Enthalpy in Changes of State

Enthalpy in Changes of State

Assessment

Flashcard

Science

9th - 12th Grade

Hard

Created by

Barbara White

FREE Resource

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17 questions

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1.

FLASHCARD QUESTION

Front

Phase Change Noun

[fayz cheynj]

Back

Phase Change


A transition in the state of matter of a substance, occurring when heat addition or removal alters its particle arrangement.

Example: This diagram shows that adding energy, like heat from a burner, causes matter to change its state (phase), such as solid ice melting into liquid water.
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2.

FLASHCARD QUESTION

Front

Intermolecular Forces Noun

[in-ter-muh-lek-yuh-ler for-sez]

Back

Intermolecular Forces


The attractive or repulsive forces that exist between neighboring molecules, which are broken or formed during a phase change.

Example: This diagram shows that the negative part of one water molecule attracts the positive part of another, creating an intermolecular force called a hydrogen bond.
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3.

FLASHCARD QUESTION

Front

Intramolecular Forces Noun

[in-truh-muh-lek-yuh-ler for-sez]

Back

Intramolecular Forces


The forces, such as chemical bonds, that hold atoms together within a single molecule and are not broken during phase changes.

Example: This diagram shows an intramolecular force as the strong chemical bond holding atoms together *within* a single molecule (like the solid line connecting Cl and H).
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4.

FLASHCARD QUESTION

Front

Hydrogen Bonding Noun

[hy-druh-jen bon-ding]

Back

Hydrogen Bonding


A strong type of intermolecular force involving a hydrogen atom bonded to a highly electronegative atom like oxygen or nitrogen.

Example: This diagram shows a hydrogen bond, a weak attraction between water molecules. Energy is needed to break these bonds, which is why it takes heat to change water's state.
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5.

FLASHCARD QUESTION

Front

Heating Curve Noun

[hee-ting kurv]

Back

Heating Curve


A graph plotting a substance's temperature against added energy, showing plateaus that indicate a phase change is occurring.

Example: This graph shows how a substance's temperature changes as energy is added, including plateaus where melting and boiling occur at constant temperatures.
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6.

FLASHCARD QUESTION

Front

Enthalpy Noun

[en-thal-pee]

Back

Enthalpy


A thermodynamic property of a system that represents the total heat content, where its change indicates heat absorbed or released.

Example: This diagram shows that adding heat energy (enthalpy) causes water to change state, from solid ice at 0°C to liquid water and then to gaseous steam.
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7.

FLASHCARD QUESTION

Front

Kinetic Energy Noun

[ki-net-ik en-er-jee]

Back

Kinetic Energy


The energy that a substance's particles possess due to their motion, with the average being directly related to its temperature.

Example: This diagram shows that particles in a gas have the most motion (highest kinetic energy), while particles in a solid have the least.
Media Image

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